Patent GB-570891-A (GB)
Title: Improvements in or relating to filing system
IPC: A47B63/06
Filed: 1944-01-25
Abstract: 570,891. Selective control. INTERNATIONAL BUSINESS MACHINES CORPORATION. Jan. 25, 1944, No. 1384. Convention date, March 11, 1943. [Class 40 (i)] [Also in Group XV] A filing system comprises a number of compartmented drawers 12 of which a selected one is brought to the operator and a selected compartment 21 is projected for examination in response to manipulation of a keyboard. Setting keyboard. The initial selection is by pressing one of a group of keys PK and then, in certain cases, a key of a group SPK. The key operation causes a momentary closing of contact 1a to cause a sequence switch PRA, PRB to take a step, releasing a relay PO and energizing a relay P1 which completes a circuit if necessary for one of the auxiliary relays SA ... SR selected by SPK and a circuit selected jointly by this relay and the PK key for one of a group of relays F11 ... F39 and one of three relays E1 ... E3. Relay R3 also is energized, locks up and energizes R5 and also magnets ST, DT which withdraw detents 175, 178, Fig. 17, from clutchcontrolling discs on an index drum which is then driven by a constantly rotating shaft 157 until a wiper 187 carried thereby encounters a marking applied by the F relay. Magnet SP then stops the drum and relay R6 pulls up. The index drum (see Fig. 15) shows the subdivisions of the selected file to assist in the operation of one of a further set of keys for selecting the compartment. R6 releases R3, R5, ST and DT. Selection and transport of wanted drawer. On operation of P1 and in dependance on the relay E1 ... E3 operated and the present position vertically of the conveyer device as indicated by the condition of cam-controlled contacts L1 ... L3, relay UP, DN, is operated to cause a motor EM to raise or lower the conveyer, the movement being stopped by R7 which is energized over one of the contacts L1 ... L3 when the required level is reached. At the same time and depending on the present orientation of the turntable carrying the conveyer (as indicated by the position of a switch TC, Figs. 10 and 20b) in relation to the desired position as indicated by a marking applied by the selected relay F11 ... F39, CL or CCL causes the motor TM to drive the table clockwise or counterclockwise, latches 96, 97, Fig. 10, having been withdrawn by a magnet 115 in response to the energization of a relay 119 by P1 and latch 98 by a magnet 127 to enable the motor circuit to be completed. Switch TC is substantially equivalent to a movable gapped ring having a single contact in the gap at one end and cooperating with fixed contacts extending over 180 degrees. When the single contact reaches the marked terminal, CL (or CCL), which locked up when energized over the switch TM, is unlocked by a relay R8 which also interrupts the motor circuit itself and releases 119. Magnet 144 operates releasing latches 96, 97 to stop the turntable in the new position and magnet 127 is released and the turntable is locked by latch 98. Relay R9 also is operated and drives the sequence switch to its next position to energize P2 which is followed by R11 which locks and energizes a motor CM to drive the conveyer carriage into the cabinet. Offnormal (central position) contacts CB1 ... CB3 change over and energize R17 which locks and operates a magnet 83 to trip a hook on the carriage into a position for engaging a pin on the drawer. In the extreme inward position, limit-switch contacts CC1, CC2 are operated and R11, R17 and 83 are released. The conveyer stops and R12 pulls up and locks and drives the motor CM in the opposite direction. On reaching its central normal position, the carriage, now carrying the selected drawer, operates contacts CB1 ... CB3 to energize R14 which releases R12 to stop the motor and moves on the sequence switch to energize P3. This energizes E2 which operates UP or DN to bring the conveyer to the middle level. In this position contact L2 energizes R7 which stops the movement. At the same time, 119 is energized to unlatch the turntable and a circuit is made by P3 to mark the central contact of switch TC to bring the turntable to its central position by the operation of CL or CCL to start the motor and R8 to stop it. With R7 and R8 both energized, R9 pulls up to drive the sequence switch on and P4 pulls up followed by R12 whereupon the carriage is driven towards the operator. On its arrival. limit switch contacts CA1, CA2 change over, R12 is released and the carriage stops. Selection of wanted file. In response to the change-over of CA1, a circuit is made via the operated key of the third group for a solenoid CP1 ... CP10 which lifts the required file. Restoration of drawer to cabinet. The operator presses key RT which steps the sequence switch on directly to energize P5 and energizes R13. The solenoid CP is released and motor CM is energized to drive the carriage towards the cabinet and when the central position is reached the operation of contacts CB energizes R16 to release R13 and step the sequence switch on. The resulting energization of P6 establishes circuits similar to those for selecting the drawer (the selecting keys still being depressed) which is thus restored to its proper place, the sequence switch being moved to its seventh position when the drawer is positioned against the cabinet to cause it to be driven home. The carriage then returns to its central position along the conveyer and the conveyer is moved to its middle position vertically but the turntable is not again operated. Finally R15 energizes the release magnet of the sequence switch and the system is ready for a new selection.